1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
7  * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8  */
9 #ifndef _ASM_CACHEFLUSH_H
10 #define _ASM_CACHEFLUSH_H
11 
12 /* Keep includes the same across arches.  */
13 #include <linux/mm.h>
14 #include <asm/cpu-features.h>
15 
16 /* Cache flushing:
17  *
18  *  - flush_cache_all() flushes entire cache
19  *  - flush_cache_mm(mm) flushes the specified mm context's cache lines
20  *  - flush_cache_dup mm(mm) handles cache flushing when forking
21  *  - flush_cache_page(mm, vmaddr, pfn) flushes a single page
22  *  - flush_cache_range(vma, start, end) flushes a range of pages
23  *  - flush_icache_range(start, end) flush a range of instructions
24  *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
25  *
26  * MIPS specific flush operations:
27  *
28  *  - flush_icache_all() flush the entire instruction cache
29  *  - flush_data_cache_page() flushes a page from the data cache
30  *  - __flush_icache_user_range(start, end) flushes range of user instructions
31  */
32 
33  /*
34  * This flag is used to indicate that the page pointed to by a pte
35  * is dirty and requires cleaning before returning it to the user.
36  */
37 #define PG_dcache_dirty			PG_arch_1
38 
39 #define Page_dcache_dirty(page)		\
40 	test_bit(PG_dcache_dirty, &(page)->flags)
41 #define SetPageDcacheDirty(page)	\
42 	set_bit(PG_dcache_dirty, &(page)->flags)
43 #define ClearPageDcacheDirty(page)	\
44 	clear_bit(PG_dcache_dirty, &(page)->flags)
45 
46 extern void (*flush_cache_all)(void);
47 extern void (*__flush_cache_all)(void);
48 extern void (*flush_cache_mm)(struct mm_struct *mm);
49 #define flush_cache_dup_mm(mm)	do { (void) (mm); } while (0)
50 extern void (*flush_cache_range)(struct vm_area_struct *vma,
51 	unsigned long start, unsigned long end);
52 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
53 extern void __flush_dcache_page(struct page *page);
54 
55 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
flush_dcache_page(struct page * page)56 static inline void flush_dcache_page(struct page *page)
57 {
58 	if (cpu_has_dc_aliases)
59 		__flush_dcache_page(page);
60 	else if (!cpu_has_ic_fills_f_dc)
61 		SetPageDcacheDirty(page);
62 }
63 
64 #define flush_dcache_mmap_lock(mapping)		do { } while (0)
65 #define flush_dcache_mmap_unlock(mapping)	do { } while (0)
66 
67 #define ARCH_HAS_FLUSH_ANON_PAGE
68 extern void __flush_anon_page(struct page *, unsigned long);
flush_anon_page(struct vm_area_struct * vma,struct page * page,unsigned long vmaddr)69 static inline void flush_anon_page(struct vm_area_struct *vma,
70 	struct page *page, unsigned long vmaddr)
71 {
72 	if (cpu_has_dc_aliases && PageAnon(page))
73 		__flush_anon_page(page, vmaddr);
74 }
75 
flush_icache_page(struct vm_area_struct * vma,struct page * page)76 static inline void flush_icache_page(struct vm_area_struct *vma,
77 	struct page *page)
78 {
79 }
80 
81 extern void (*flush_icache_range)(unsigned long start, unsigned long end);
82 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
83 extern void (*__flush_icache_user_range)(unsigned long start,
84 					 unsigned long end);
85 extern void (*__local_flush_icache_user_range)(unsigned long start,
86 					       unsigned long end);
87 
88 extern void (*__flush_cache_vmap)(void);
89 
flush_cache_vmap(unsigned long start,unsigned long end)90 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
91 {
92 	if (cpu_has_dc_aliases)
93 		__flush_cache_vmap();
94 }
95 
96 extern void (*__flush_cache_vunmap)(void);
97 
flush_cache_vunmap(unsigned long start,unsigned long end)98 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
99 {
100 	if (cpu_has_dc_aliases)
101 		__flush_cache_vunmap();
102 }
103 
104 extern void copy_to_user_page(struct vm_area_struct *vma,
105 	struct page *page, unsigned long vaddr, void *dst, const void *src,
106 	unsigned long len);
107 
108 extern void copy_from_user_page(struct vm_area_struct *vma,
109 	struct page *page, unsigned long vaddr, void *dst, const void *src,
110 	unsigned long len);
111 
112 extern void (*flush_icache_all)(void);
113 extern void (*local_flush_data_cache_page)(void * addr);
114 extern void (*flush_data_cache_page)(unsigned long addr);
115 
116 /* Run kernel code uncached, useful for cache probing functions. */
117 unsigned long run_uncached(void *func);
118 
119 extern void *kmap_coherent(struct page *page, unsigned long addr);
120 extern void kunmap_coherent(void);
121 extern void *kmap_noncoherent(struct page *page, unsigned long addr);
122 
kunmap_noncoherent(void)123 static inline void kunmap_noncoherent(void)
124 {
125 	kunmap_coherent();
126 }
127 
128 #define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1
129 /*
130  * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
131  * cache writeback and invalidate operation.
132  */
133 extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
134 
flush_kernel_vmap_range(void * vaddr,int size)135 static inline void flush_kernel_vmap_range(void *vaddr, int size)
136 {
137 	if (cpu_has_dc_aliases)
138 		__flush_kernel_vmap_range((unsigned long) vaddr, size);
139 }
140 
invalidate_kernel_vmap_range(void * vaddr,int size)141 static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
142 {
143 	if (cpu_has_dc_aliases)
144 		__flush_kernel_vmap_range((unsigned long) vaddr, size);
145 }
146 
147 #endif /* _ASM_CACHEFLUSH_H */
148